Device for detachably mounting a manuscript on a rotary cylindrical drum for cylinder scanning type facsimiles

Abstract

A device for detachably mounting a manuscript on a rotary cylindrical drum for cylinder scanning type facsimiles. The device comprises a cam operating lever rotatable together with a drum cover, a segmental cam provided at its peripheral edge with stepped cam surface portions, and an arm for operating the clamping bar and having one end rotatably supported by a pin threadedly engaged with a shaft which is perpendicular to the pin and rotatable about its axis, the free end of the arm being resiliently urged against the stepped cam surface portions of the segmental cam and having a block piece for selectively operating the clamping bar. The selective operation of the drum cover only permits to raise the clamping bar from the rotary cylindrical drum so as to remove the manuscript and stop the rotary cylindrical drum and lower the clamping bar toward the rotary cylindrical drum so as to clamp the manuscript to the rotary cylindrical drum and rotate the rotary cylindrical drum.

What is claimed is: 
     
       1. An apparatus for detachably mounting a manuscript on a cylindrical drum for cylinder scanning type facsimiles, employing a rotary cylindrical drum (1) around which is wound a manuscript (20), a clamping bar (2) arranged in parallel with an axis of the rotary cylindrical drum (1) being resiliently urged against the drum (1) so as to detachably move one end of the manuscript (20) on the drum (1), said apparatus including a drum cover (5) having one end rotatably mounted on a shaft (6') for supporting frame (1') and being disposed to open and close an opening provided for casing means enclosing the drum (1) therein, a cam operated lever (6) being integral and rotatable with drum cover (5) at one end, a segmental cam (8) rotatably mounted on a pivot (9) secured to the supporting frame (1'), said cam (8) having stepped cam surface portions at its peripheral edge formed of a lower portion (8a), a higher portion (8b) and a tapered portion (8c) extending between the lower and higher portions (8a), (8b), the higher portion being terminated at a projection (8d), said cam (8) being further defined by a pin (7) which is connected through a spring 11 passing over the center axis of said pivot (9) of the segmental cam (8) in response to movement of cover (5) from closed to fully open positions, respectively, an arm (13) cooperating with said clamping bar (2) and having one end rotatably supported by a pin (14) threadedly engaged to shaft (15) disposed perpendicular to said pin (14) and rotatable about its axis, the free end of said arm (13) being resiliently urged against said stepped cam surface portion of said segmental cam (8); block piece (18) associated with arm (13) being adapted to selectively operate said clamping bar (2), and microswitch 19 having normally open contacts which close responsive to the operation of said cam operating lever (6) when said drum cover (5) arrives at its fully closed position (5') to thereby energize a driving motor of said drum (1), and the contacts of microswitch (19) being open responsive to opening of said drum cover (5) for deenergization of said driving motor of said drum (1).